5081561 has 2 divisors, whose sum is σ = 5081562. Its totient is φ = 5081560.

The previous prime is 5081519. The next prime is 5081563. The reversal of 5081561 is 1651805.

5081561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4326400 + 755161 = 2080^2 + 869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5081561 is a prime.

Together with 5081563, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 5081561.

It is not a weakly prime, because it can be changed into another prime (5081563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2540780 + 2540781.

It is an arithmetic number, because the mean of its divisors is an integer number (2540781).

Almost surely, 2^5081561 is an apocalyptic number.

It is an amenable number.

5081561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5081561 is an equidigital number, since it uses as much as digits as its factorization.

5081561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 5081561 is about 2254.2317981964. The cubic root of 5081561 is about 171.9223667137.

The spelling of 5081561 in words is "five million, eighty-one thousand, five hundred sixty-one".